c1
--

+ ip tcp_metrics show
10.4.0.67 age 76.230sec cwnd 10 rtt 1901us rttvar 2727us source 10.4.0.50
10.4.0.66 age 0.033sec cwnd 14 rtt 4303us rttvar 6631us source 10.4.0.50
192.168.119.82 age 11.023sec ssthresh 21 cwnd 10 rtt 5698us rttvar 5980us source 192.168.115.50
10.4.0.50 age 76.498sec cwnd 10 rtt 4393us rttvar 6023us source 10.4.0.50
10.4.0.82 age 0.291sec source 10.4.0.50


s1
--

+ ip tcp_metrics show
10.4.0.50 age 76.545sec cwnd 10 rtt 1711us rttvar 3068us source 10.4.0.82
192.168.115.50 age 10.973sec cwnd 10 rtt 905us rttvar 635us source 192.168.119.82


m1
--

+ iptables -t mangle -L POSTROUTING -n
Chain POSTROUTING (policy ACCEPT)
target     prot opt source               destination         
TOS        tcp  --  0.0.0.0/0            0.0.0.0/0            tcp flags:!0x17/0x02 TOS set 0x01/0xff


m2
--

+ tc -s -d qdisc show dev ens192
qdisc cake 1: root refcnt 2 bandwidth 50Mbit besteffort flows nonat nowash no-ack-filter split-gso rtt 100.0ms raw overhead 0 sce 
 Sent 8271604 bytes 124970 pkt (dropped 0, overlimits 193 requeues 0) 
 backlog 0b 0p requeues 0
 memory used: 4352b of 4Mb
 capacity estimate: 50Mbit
 min/max network layer size:           42 /     722
 min/max overhead-adjusted size:       42 /     722
 average network hdr offset:           14

                  Tin 0
  thresh         50Mbit
  target          5.0ms
  interval      100.0ms
  pk_delay          3us
  av_delay          2us
  sp_delay          1us
  backlog            0b
  pkts           124970
  bytes         8271604
  way_inds            0
  way_miss            4
  way_cols            0
  sce                 0
  marks               0
  drops               0
  ack_drop            0
  sp_flows            1
  bk_flows            1
  un_flows            0
  max_len           722
  quantum          1514

qdisc ingress ffff: parent ffff:fff1 ---------------- 
 Sent 365104364 bytes 248452 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0

+ tc -s -d qdisc show dev ens224
qdisc cake 1: root refcnt 2 bandwidth 50Mbit besteffort flows nonat nowash no-ack-filter split-gso rtt 100.0ms raw overhead 0 sce 
 Sent 375142488 bytes 248452 pkt (dropped 0, overlimits 369929 requeues 0) 
 backlog 0b 0p requeues 0
 memory used: 101440b of 4Mb
 capacity estimate: 50Mbit
 min/max network layer size:           42 /    1514
 min/max overhead-adjusted size:       42 /    1514
 average network hdr offset:           14

                  Tin 0
  thresh         50Mbit
  target          5.0ms
  interval      100.0ms
  pk_delay        5.1ms
  av_delay        4.4ms
  sp_delay          1us
  backlog            0b
  pkts           248452
  bytes       375142488
  way_inds            0
  way_miss            4
  way_cols            0
  sce            222324
  marks             439
  drops               0
  ack_drop            0
  sp_flows            0
  bk_flows            1
  un_flows            0
  max_len          9084
  quantum          1514

qdisc ingress ffff: parent ffff:fff1 ---------------- 
 Sent 6522132 bytes 124970 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0

+ tc -s -d qdisc show dev ifb4ens192
qdisc netem 1: root refcnt 2 limit 1000000
 Sent 375142946 bytes 248457 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0

+ tc -s -d qdisc show dev ifb4ens224
qdisc netem 1: root refcnt 2 limit 1000000
 Sent 8272062 bytes 124975 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0